SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f42140d14c13ae2d1ed98860e4c754428fbef7b535692545fd27c1fcafa665a' 
  AND token = 'D04umQmCxlBBoWXjpbCZxVnf3JHf4JE+YJ5XKfq7Shc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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