Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ac47efb299c33abcdf36ecf25a888388fd8dc990e8414951c6f69826f5d100' 
  AND token = 'cVnXi3t7eqRf9Nqj9bs6TudBhHvgFWH2d/xWyBFivoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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