Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88f1e0e9e99e37da5f38412454239716dfb61112991d9420b02e993997bfc11' 
  AND token = '95awQhDzcT4CTxpioRLcAtMsdO1jrDM/AdmGyuA7dn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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