SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9619cdaecc16fc7305f7a32b564c8fe0e6f672fbba29b2f4cb58f3387b64ecc7' 
  AND token = 'FCz/MAOrGfr4/jyFLlC+VT0n3Mj6eJjmGpwPpq11vgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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