Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9137122dc89b2923403e2fe63f40d4834170f8f759c246947a6a79616365af7e' 
  AND token = 'rtMMQ2XCpLJiQ3HSirQiMaSr7ydS/3lRiRH4MywQSaY=' 
  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"
    }
  }
}