Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71df6ae6e41a2cfde79333acbf06c72bca35e94b544748ea893d91426cdf62e4' 
  AND token = 't/FjgskoISb7vXlrXA0GG57DC0bJcSD+xaBGxPuaRA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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