SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c055132e596ecd6f55609a596184030552db5ffc87e36613884036b6c20d97' 
  AND token = 'siV2MGVCE1QBQ8Kv+Vmklc+qbbGKMs3HUPm6ZvI7/Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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