Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ce36064c343b8449b6d400e530a6dec49a88fcc5ef6ed1db6b86025e704e22' 
  AND token = 'hnb+wgpyFPz3z7Q1Wix/J+vQguRc8wgzz+7lTcFZ3Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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