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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15c16694ed072e623d6e0f93f98ccad0b45a2ba80c283e9adde57777e3cdcf9' 
  AND token = 'Z7waruoUQ0tS9G09Kl7ewaV2GboQ5PBA3OHniuRZGQQ=' 
  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"
    }
  }
}