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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f9a8613deae8b3383641e3ce448e682cd656b0d425a7a4b192ae0f8c86bf43' 
  AND token = 'LOzno7pgGolhgxbPUM1d5cGypBwae4LtOnzKYYGI148=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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