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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d10e718599587ed05198196f7a077a8f239c077cb36a7762063862a51bd78d' 
  AND token = '8X5r8QNlHBQmoMQKHc3AtDZMyRP4OgKOuCSmMJF7E34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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