Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610a800e6cd1004d6f04892fd44782a74b89544b246c275d84888e817ad19177' 
  AND token = 'ICxg6IkK8TsplFiT4JoCh5xC6V32b3VlIIY88bTnHOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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