SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a074eab60a740c51059b37f1699ac5093d818e15f48d3bf201ef08f39254b8' 
  AND token = 'Bpahlz6OgQFDgZPRw+ENU4aBG0v3NdFiiOUzlTV66VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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