SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9727e95578a53253648b827a599fb0dd2e69120b11ee222f13bff844241e3285' 
  AND token = '/Q3NgeV4lN7E/FRDC9LtpX8sPnVWuovnzGmJB7u6pBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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