Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '461790fdb28db93c480e1aa74f6383e712d482355918e3a6b1336b12010afab5' 
  AND token = 'WKaJh00AzX4kuJA93fswLDDlQr62CYPS20V96fJxztM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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