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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf8031fc40f8b01924126e8e14abea993c8bbf5bdc5e04fde218f586c7d219c' 
  AND token = '1er/tyfEDiV1H2VvlAA0K4ALMdGZ5fGHMaAi0Wf0NhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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