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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43711bffb0fef0a5d9bc3ab25c41330b52e8b1904d17483bccd59e66e8bcc76c' 
  AND token = 'KH1iixk3vaMZUsPZuLKK9cJt63HP1yvU5nVGCqtzau0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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