Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c4bfbaf4210d61b7a54ff91dfe12f01b174b169c46cc31c75579f12e0d5be98' 
  AND token = 'sjEmSvJqzFX7r49V5NPu1eNhqjPLn7rdXDKPXQ3ENhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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