unrecognised keyword 'CASE'

$ ./lint-query --query 'SELECT * FROM `Caracteristiques` WHERE CASE `an` WHEN 86400 THEN 4 WHEN 604800 THEN 5 WHEN 2419200 THEN 6 WHEN 31536000 THEN 7 ELSE -1 END < 0;'
#1: Unrecognised keyword. (near "CASE" at position 39)
#2: Unexpected token. (near "`an`" at position 44)
#3: Unrecognised keyword. (near "WHEN" at position 49)
#4: Unexpected token. (near "86400" at position 54)
#5: Unrecognised keyword. (near "THEN" at position 60)
#6: Unexpected token. (near "4" at position 65)
#7: Unrecognised keyword. (near "WHEN" at position 67)
#8: Unexpected token. (near "604800" at position 72)
#9: Unrecognised keyword. (near "THEN" at position 79)
#10: Unexpected token. (near "5" at position 84)
#11: Unrecognised keyword. (near "WHEN" at position 86)
#12: Unexpected token. (near "2419200" at position 91)
#13: Unrecognised keyword. (near "THEN" at position 99)
#14: Unexpected token. (near "6" at position 104)
#15: Unrecognised keyword. (near "WHEN" at position 106)
#16: Unexpected token. (near "31536000" at position 111)
#17: Unrecognised keyword. (near "THEN" at position 120)
#18: Unexpected token. (near "7" at position 125)
#19: Unrecognised keyword. (near "ELSE" at position 127)
#20: Unexpected token. (near "-1" at position 132)
#21: Unrecognised keyword. (near "END" at position 135)
#22: Unexpected token. (near "&lt;" at position 139)
#23: Unexpected token. (near "0" at position 141)

I am using the version shipped with phpMyAdmin 4.9.1. The query works.

SELECT VERSION();
5.7.27-30-57-log

Start by reproducing the query with the lint-query entry point and inspect how the SQL parser handles CASE, WHEN, THEN, ELSE, and END tokens. Add coverage for this query and confirm that valid MySQL CASE expressions no longer produce the reported errors.