Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'def5af2f50f0c6d60dc4c376f0763ac69f90777d7e56c8541d368143c72f1cc6' 
  AND token = '6SJdgUbnEmPOyOW7nHHmPz/rcwsRR7qnRw/lcx9cJCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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