Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4444df75d13f996932586ecdb6a354b08ecc873895d5dae3429f108773ee110f' 
  AND token = '9T0/ZbCqQRk8iSFE6ncjpdoXcfnBL2sXtxZ8YKA7eGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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