Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c8ae7b8236db1385dd5acf2f0f3025d7330215cfeb3d43e79062163de4238f' 
  AND token = 'r7b09fZgGRtYyE654axTpPV5AQkfBXQb7ZK9DMm/kmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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