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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f7890005e35fd0079aa9fdc04bd0282490cdd80c2603979b7b41540e670c70' 
  AND token = 'avzGM2je+BbkrayQ/JB07oGvEDpyCkJcLyboDbuTZsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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