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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef3cbe334f1a8248875940724378984e42fdb461ac80f5989a9c9368c3bc857' 
  AND token = 'BeLM8FFqlQ7N2F3a5/qqAFRqUI2vPVZVNYp9yas1iIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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