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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1862cb58297f8802cfc6a8ce543280b4191675c139f0438a56afeba5a720ed' 
  AND token = '9v45USMVxBKunfv5bSlcHmyG6UO9QOMdqTeXmjrn/nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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