SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afbc4e600923284473b1dc9cacd62ac2fd270a415e64687f635659932390df7' 
  AND token = 'fGP/6MQ9pCggkv/usY717v95sJRTVHb9zVgFM1lQ+3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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