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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6dfcd5c8d23993fb3caf6ab6aa016271095096f21e154607c695ceb8488a866' 
  AND token = '66QFRa7K1T8Aun9Mv9AKV1N2LyIXG8nWxm1itJ2K7ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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