Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf54f21b2b1ff0711ff6d7f65a4dc81236e180e10e8306b0b020fc82d92e7e1' 
  AND token = 'xGo3PoDH+fmQq2qr0jcaj8xtuzG2NHL+OI05csVeWas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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