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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7f6fdde17d1443331dfc6765724f9c6f95cb4a8785ab7b948388e306924bbf' 
  AND token = 'xEj41EBUV3mVhHEffq6NWNcqZHRiO6upLOAhnqQdi6U=' 
  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"
    }
  }
}