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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a7b30a53ea5ba0ab6b0d1abea5f5aef21c6f6a423c3a254b7dc080c8937cd9' 
  AND token = 'SsDzg3JMzUR/kFueRF8K7gun1Del8YiOjCs8OrsUBso=' 
  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"
    }
  }
}