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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1b5a5d464c0b143efd31669e1892b9775e903b7333ac001976196eca0ba326' 
  AND token = 'thfpytWg6xU/yty7qkIyNs91S+4c/5rOloZ5VYTKA+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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