Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6482cf3c3b60c73efedbad6fd8ae81e67ae7fe524aab0fd79f83df32202e0d66' 
  AND token = 'uxh9PsYw86cpkPi9OcCD0bTtZySWKrFTYzIxYH0ukHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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