SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af10219bfa1d4425111e3e7c48b8ee15353044ceb33ba649a8da89c58d26bef' 
  AND token = 'gdRdfVdtmrKYvkjn6LwV61wVnQgZjd2nBUzWw1hqxT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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