SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123aa486da313990e9162fb2d39df14565112b5678205df5079f79ecf1316810' 
  AND token = 'k9GPCItRuxxlGgvlrHpRYdaiVVVW+TyAlzUX6Yo69Lw=' 
  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"
    }
  }
}