Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f85b955b5d82a15ba91bfda3cb7ad4a306c1669a32b8d4364b359f9e3187763' 
  AND token = 'TZIF0Ff6N0poDnRHMj2fHGP0Y4SOw8EAhPEI4CKuCQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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