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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e9a8914a66f4a0c4c5a7a303358442539d8d78b39389b62e8f49d1bb1eec48' 
  AND token = '10XLN56SYXpTdCYqKXGD0HJThbah4XwqWlszr2IHar8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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