SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d686208454faca7281567b153f1097fdebc37b227e33c5a106cbe22ae09c8f' 
  AND token = 'DVwuwk7E+w9h79JBQ8zm+Y2DFts5VZVYKvvHzslfqdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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