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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39c6c4f297cd8cae59a2e15cf67a1059b564c3418dd6f3277a1b49c466f5dc8' 
  AND token = 'cQkGMYajj5QeET0B/1ICST7H3qClbCMfgUNaiC108JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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