SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524621462e2d2596747f6b59042cdc93fed513348887f9296c6b79bec5da3c01' 
  AND token = 'xj4YW+QYXlNGerGyBGO3ywm8bKQBUQ9cmG0Nzng7L6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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