Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197231799e210fba46af31e2912c5ca41a3b7298e4779ccf8127d252e15258c1' 
  AND token = '9USjxQRHZofVT13gX1V6hGU/v3f/d3LRIQmMTDG9hac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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