Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b333a589eb7ea2951b3fc8ec6594930e8985e15f47af2ae8783367537e5c8c9' 
  AND token = 'K4Oy4bBwQuLtrQD1AltIZ8Bi5qOlpXFCR+7NacSM/4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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