SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb67ac05c301ab44825d732e795327f60cf44c667236bd2c4d577194e1d5b396' 
  AND token = 'eSEDeCx91lqDpNnisqdf+Z+CN1ygPWYtghGVDOwubj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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