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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ba793a88382ac656373cc25765255d650e6126116bce03bcb5668cfbe3109c' 
  AND token = 'bCZcz40ZgI7Ouhd5jNl9E6BxRDzCJs7u0PiU9L7Xi2s=' 
  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"
    }
  }
}