Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641045bd0dd45857c849e53841ab2fa1e4b7589df67c29fc9d9a657427208c89' 
  AND token = '3gN13jBfXQEV7yPJBV5qjW8aa5cFTbflDet88UFrFB0=' 
  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"
    }
  }
}