SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f07cf5e30471a911950a28108451fbf530217a16e132653b6432e0953c35c93' 
  AND token = 'z5A8cQ5G7WVZVLm9wjJSx+GPEJFT9vxQZZ7ff/qx/F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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