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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b03931af6b4b5d2d36af6386dd8b12528c9b740c58f3c18a4223fa0f4245ef' 
  AND token = 'KrD1+FeQqCoTkfAKV3Dof5dv74y0UrWpz6gqCUfA9ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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