Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42db0f944cd2cd053950b273e3146c874406afbd1248ff0c91572d6ff1d32d7' 
  AND token = 'Jj5Ia1VyWObZqDfI9mxmcLi8zYNzBnor6a31WAWIAKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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