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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3e7d799befe89243602fcb737f26bb0f35d7e089bb749f537ac4dde535a0b8' 
  AND token = 'NApg515Djf5mUrGHQ0jUE07Kn/BcmrdV40j8mhHQ/QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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