Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8efe7a9eda89be094ecd04d04bf2d590788b0691866ab94b5d158dda9dd4d13' 
  AND token = '4huSxoa/bba3NNnrucNd+I4PH8HVRzw+P4qQfwJWq90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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