Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5253115127df348e6d4e8bb52871df122cd46ef14f989242e72309f5fdfbfc' 
  AND token = '4TpFUnOCfSfRVRRvdG7RlnBdsBlxTDqre4GnDhtcncg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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