SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f990acc5ff3fabb03054467feb0c6189e5795ba45e6b6fe772dcda0216162c1' 
  AND token = 'AqWBHawY2A9QOTO8R/0z83l/Hv8KC+TMRESViuJM9YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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