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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc81a740d6b96aba6f4c5c9a208b4b3c492631e06baa79d055188a07837c1a31' 
  AND token = '3HMBDCahGwldFUhCRlTOdqbRu9e0s6fD6opMaxInI/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}