Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e76a47bd2133c779152d0abb490a2d03124e6b94f23dce558321e4fb4abbb30' 
  AND token = 'M3GjQ3BKXwQPMXWny9y2GCiffa4vMIhOGz5AhuZUeQA=' 
  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"
    }
  }
}