SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9150aaa1dcb19be3d1248b60682ff8c8a70a0bdc7d5662dc6d475788afa010e8' 
  AND token = '43vAXsp6YgUkJFGL3/ihFqDqvdHIg4cuZOlG1yV0FVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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