One takes 3 seconds the other takes 30 seconds. Why?

The following 2 queries have only "OR 0=1" different. One has it and the other does not. Yet the one with it runs in 30 seconds and the one without it runs in 3. The network, execution, i/o and sort are also the same. Why is this happening:
--Take 30 seconds
SELECT *
FROM TESTSCHEMA.TESTTABLE
WHERE TESTCOL='49W7DWCA0W0Z21'
OR TESTCOL='9UQ3GXCA01VFJB' OR TESTCOL='C5B51A15D1304F' OR TESTCOL='8XR2JWCA08GSS8' OR TESTCOL='4PTD8QCA06D3PJ'
OR TESTCOL='26XEOVCA036F6O' OR TESTCOL='12KKGYCA059XEE' OR TESTCOL='8IGMKXCA0V358H' OR TESTCOL='9OG4KVCA09QUSH'
OR TESTCOL='8KILJUCA0UVNFQ' OR TESTCOL='06O1UUCA018KUF' OR TESTCOL='41BG4XCA0C8XD9' OR TESTCOL='97D4UUCA0DOXCE'
OR TESTCOL='02YDTWCA0Z95RB' OR TESTCOL='3NG4AYCA0M6TMO' OR TESTCOL='6PZ83XCA04DXNC' OR TESTCOL='BEF4B81FFC3B4D'
OR TESTCOL='2E032A0B5A9F4C' OR TESTCOL='8D701440E7B446' OR TESTCOL='1JCPWWCA0951UC' OR TESTCOL='8HCCGYCA08UC9A'
OR TESTCOL='3CAFD292736B4F' OR TESTCOL='7KJXUWCA0R43IL' OR TESTCOL='4TKCASCA09ISF1' OR TESTCOL='034M1WCA0S5O1X'
OR 0=1
--Take 3 seconds
SELECT *
FROM TESTSCHEMA.TESTTABLE
WHERE TESTCOL='49W7DWCA0W0Z21'
OR TESTCOL='9UQ3GXCA01VFJB' OR TESTCOL='C5B51A15D1304F' OR TESTCOL='8XR2JWCA08GSS8' OR TESTCOL='4PTD8QCA06D3PJ'
OR TESTCOL='26XEOVCA036F6O' OR TESTCOL='12KKGYCA059XEE' OR TESTCOL='8IGMKXCA0V358H' OR TESTCOL='9OG4KVCA09QUSH'
OR TESTCOL='8KILJUCA0UVNFQ' OR TESTCOL='06O1UUCA018KUF' OR TESTCOL='41BG4XCA0C8XD9' OR TESTCOL='97D4UUCA0DOXCE'
OR TESTCOL='02YDTWCA0Z95RB' OR TESTCOL='3NG4AYCA0M6TMO' OR TESTCOL='6PZ83XCA04DXNC' OR TESTCOL='BEF4B81FFC3B4D'
OR TESTCOL='2E032A0B5A9F4C' OR TESTCOL='8D701440E7B446' OR TESTCOL='1JCPWWCA0951UC' OR TESTCOL='8HCCGYCA08UC9A'
OR TESTCOL='3CAFD292736B4F' OR TESTCOL='7KJXUWCA0R43IL' OR TESTCOL='4TKCASCA09ISF1' OR TESTCOL='034M1WCA0S5O1X'

Per Toad and Embarcadero DBArtisan, yes:
OPERATION                         OBJECT NAME          ROWS     BYTES     COST
SELECT STATEMENT Optimizer Mode=ALL_ROWS                    28           32.0352755426037
INLIST ITERATOR
TABLE ACCESS BY INDEX ROWID           TESTSCHEMA.TESTTABLE     28      67 K     32.0352755426037
INDEX RANGE SCAN                     TESTSCHEMA.PK_TESTCOL     28          3.00250168633582
SELECT STATEMENT Optimizer Mode=ALL_ROWS                    28           32.0352755426037
INLIST ITERATOR
TABLE ACCESS BY INDEX ROWID           TESTSCHEMA.TESTTABLE     28      67 K     32.0352755426037
INDEX RANGE SCAN                     TESTSCHEMA.PK_TESTCOL     28          3.00250168633582

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Attachments:
Readfiles.vi ‏23 KB

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