Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a901a9d4ce47ae21af79b378f0a6198aca9361f906bc147e454806139da6aa' 
  AND token = 'lu4vESeHkQT1OmH4wFFSXt+9Hjs8KT87reLY1BlSwro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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