Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99797b5b203f0fd39f58ba3d7d53f87339eae38e22516633545d1338119831b' 
  AND token = '6O15uZmvwXtKhmbpWwyzL5caXk9jCQVvZO4unew6Me4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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