Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d51336edbe85b2512d729f66dc2439eca015eb4c9e4d746609a64d5bcc56750' 
  AND token = 'GJe+EH15GSaUeQnvkpMkPPVDf7Fe0thZziy4SFCJ7jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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