SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a4ef1c235f9f7518f73c677ee1c335ca91fb48536af29c5dfe8993f9946885' 
  AND token = 'wvpXUW/ynZBdCEOBvmJj5s9auVMTtVrbSDK4x9jASOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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