Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e991ab2475df2f72c149959f1b4ae274b94b25cfb0a75e1c23e0b9bb43a69f33' 
  AND token = '/9NE/JFbgfbNbRusOp+eHIFQP5jX6brMr3IOjYrYDsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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