Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a225a7c1e85a65acbe00c744adacb48dd103e09941bd0ca7ed9e31430722b21d' 
  AND token = 'HtRrzIZFMmoUPzlx0ogGbzFa/QC0NVYp4lCEOPGqgXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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