Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107ec95840b9939e48cdef53878769f37a77b3288a18cc95f7d1ddb727a43e20' 
  AND token = 'BiKml80P9Wwnj3T2z1BJNUMMzbej/qlZexW051pLTCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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