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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed3b8aaa5be7b4761a6026b2f604b35bf52b308c7e1a1ab21eb3ff5386ad8cb' 
  AND token = '3wBi834ch7w4RIA7KEbwM35Hibi3AEO4k8VETZMPnRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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