SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409bd64594a6d57bbdd3b28aa96899d0240167c775a6912bbff78fa18a65d03e' 
  AND token = 'Yh+TpJKAZU7RMRA7Kp8q6HvKAno2KjA0v7KJzPDEEqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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