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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b471efaf71caf7c54a52684d341b9f66a2c5948b296223b60774c7eb0bbf89' 
  AND token = '97vT6GdaZ1ItKqwjQ7oz6ZRew61miHZ9jg9kXhKZE6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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