SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e7f90645096571a526bf0bf298c45179355c79a7b4463f33acff2f2a820a9d' 
  AND token = 'c5FmlX/FHqFTMdD/zBu1GmvBlZloeOGf0dnLuENv2Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables