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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133fd2279037b83104ae1b3b9f08f3c413261a99afd8cab305bc4822fc86bdb2' 
  AND token = 'hzpN7fkvS9k9rKjMhNvhr/mjrnj31p+zVh7GYJ9s03U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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