Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a701a2f5d6a3d388aa4b3a17f556f0d38c6083e083eb83eba46a9f929271fbe3' 
  AND token = 'Q4Ylgr2Hl+bzbZQ6goFp7/xTNaeyTWbJo6akhB/CEwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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