Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdb148c98534d493755518f18a9e267bcd839a487d3a84e4830af7fabe3e1ab' 
  AND token = 'zF/0mer9baCk8CTkzL6hyIo0wy/TWdFJ4DW6hFkTapg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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