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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7922ef53c7f9657f2277717d7934bb248075c6022b248528284b9d111064a8ac' 
  AND token = 'XUYJ2CkbE96IPmLr5m1IOSCK/1yd7CbLxRVQnF5O3MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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